Truss Agent MCP Server

truss-agent-mcp

Truss threat intelligence via Model Context Protocol and a terminal assistant — one binary: truss-mcp.

Two surfaces

Hosted MCP (OAuth, Growth+ gate, five tools) is served by the Truss API. This package ships configs, validate-remote / doctor --remote, CLI search, and optional local stdio. Community accounts cannot consent to hosted MCP.

Not on npm yet. Install from this repo (npm install -g .). After publish: npm install -g @truss-security/truss-agent-mcp.

Quick start

cd truss-agent-mcp
npm install && npm run build
npm install -g .
truss-mcp doctor --remote --strict-oauth   # OAuth path hosts use
truss-mcp init                            # for CLI search / legacy stdio
truss-mcp search

Node.js 18+. Binary name truss-mcp avoids conflict with @truss-security/truss-sdk's truss command.

What you can run

Guided search workflow

One REPL with MCP tools always connected. The assistant classifies your intent and asks before querying Truss API:

1. Knowledge — Truss platform, cyber security context, threat background
2. Build filter — draft FilterQL, validate, confirm
3. Query — run executes confirmed filter (default 7 days)
4. Format — stix for STIX export; JSON summaries in-thread
5. Detection rules — detect splunk, detect falcon, detect cortex from search results

The assistant offers next steps explicitly: build a filter, refine it, query Truss API, export JSON/STIX, or generate SIEM/EDR hunting queries.

• Wider windows (run 30, days 30) may use more API quota
• Context-only follow-ups (IOC dedupe, reformat) use thread history without re-querying

Full REPL reference: guides/truss-cli.md

Terminal display (REPL)

truss-mcp search uses color-coded, ASCII-bordered output:

• You — your message
• MCP — live tool trace (→ search_threats on remote, or → search_products on stdio)
• Results — structured product table before the assistant summary
• Truss — assistant reply (cyan), guided offers (yellow), FilterQL blocks (magenta)

Controls: color / color on / color off / color auto · env TRUSS_MCP_COLOR · standard NO_COLOR=1

MCP host (Cursor / Claude) — remote OAuth (recommended)

No API key in host config. Growth+ Truss account; browser OAuth consent.

{
  "mcpServers": {
    "truss-mcp": {
      "url": "https://api.truss-security.com/mcp"
    }
  }
}

Samples: config/cursor.mcp.json · config/claude_desktop_config.json · guides/client-setup-cursor.md.

Legacy stdio (air-gap)

{
  "mcpServers": {
    "truss-mcp": {
      "command": "truss-mcp",
      "args": ["mcp"],
      "env": { "TRUSS_API_KEY": "YOUR_KEY" }
    }
  }
}

See config/cursor.mcp.stdio.json and guides/getting-started.md.

Remote MCP OAuth validation (registry gate)

Use as the OAuth + MCP doctor before registry publish or release. After OAuth it requires search_threats to return at least one Truss product (id + title). The access token stays in memory for that process only unless you pass --save-token.

truss-mcp doctor --remote --strict-oauth
# or:
truss-mcp validate-remote https://api.truss-security.com/mcp --strict-oauth

After token exchange it prints an OAuth compatibility checklist (resource URI, redirects, PKCE S256, issuer match, audience vs MCP resource, truss_role), then proves MCP access with real Truss data.

Options:

truss-mcp validate-remote https://api.truss-security.com/mcp --verbose
truss-mcp validate-remote https://api.truss-security.com/mcp --strict-oauth
truss-mcp validate-remote https://api.truss-security.com/mcp --save-token /tmp/truss-mcp-token
truss-mcp validate-remote https://api.truss-security.com/mcp --token-file /tmp/truss-mcp-token
truss-mcp validate-remote https://api.truss-security.com/mcp --port 9877
truss-mcp validate-remote https://api.truss-security.com/mcp --no-open

• --verbose — HTTP statuses, key headers, truncated bodies (tokens redacted)
• --strict-oauth — exit 2 if the OAuth checklist has WARN/FAIL (even when Truss MCP calls succeed)
• --save-token PATH — write the access token for local replay (mode 0600; delete after debugging)
• --token-file PATH — skip browser OAuth; reuse a saved token to re-check MCP access + Truss data

Optional automated OAuth data tests (saved token + TRUSS_RUN_MCP_OAUTH=1) are documented in guides/publishing.md.

Official listing: server.json (com.truss-security/truss-mcp) · Tracker: guides/registry-submission.md · Internal metadata: config/mcp-registry.json · Architecture: docs/05-hosted-mcp-oauth-architecture.md

Configuration

Env load order (shell vars win): ~/.config/truss/env → ~/.truss/.env → ./.env

Full list: env.example

Documentation

Guides — install, REPL, MCP clients, FilterQL examples

• Getting started
• Terminal REPL
• FilterQL cookbook
• Cursor setup · Claude Desktop

Reference — API contract, tools, architecture (docs/README.md — docs 01–06)

Development

npm install && npm run build
npm test
npm run truss:search    # from source without global install

Contributors / AI agents: see AGENTS.md for repo operations and conventions.

Publish: guides/publishing.md · Changes: CHANGELOG.md

Related

• @truss-security/truss-sdk — API client
• truss-agent — scheduled webhook delivery
• Truss docs — public API / SDK documentation

MIT